Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Preparation of Alumina Powder from Aluminum Salts by Precipitation Method

알루미늄 염으로부터 침전법에 의한 알루미나 분체의 제조

  • 이전 (인하대학교 무기재료공학과) ;
  • 최상욱 (인하대학교 무기재료공학과) ;
  • 조동수 (인하대학교 무기재료공학과) ;
  • 이종길 (인하대학교 무기재료공학과) ;
  • 김승태 (인하대학교 무기재료공학과)
  • Published : 1993.12.01
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Abstract

Alumina hydrates were prepared by the neutralization of AlCl3.6H2O solution with NH3 gas diluted with N2 gas. The values of pH in reaction solution influenced the formation of alumina hydrates minerals. Amorphous alumina hydrates, for example, were formed at ${\gamma}$-Al2O3longrightarrow$\delta$-Al2O3longrightarrow$\theta$-Al2O3longrightarrow$\alpha$-Al2O3. (2) Bayeritelongrightarrowamorphouslongrightarrow${\gamma}$-Al2O3longrightarrow$\delta$-Al2O3longrightarrowη-Al2O3longrightarrow$\theta$-Al2O3longrightarrow$\alpha$-Al2O3. On the other hand, the shape of alumina hydrates whichw ere prepared by the reacton of Al2(SO4)3.16H2O solution and NH3 gas was spherical, the progress of its phase transformation with increasing temperature was amorphouslongrightarrow${\gamma}$-Al2O3longrightarrow$\alpha$Al2O3 in sequence.

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References

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